John Argo.What Is DarkSF? DarkSF is the Dark Chocolate of Science Fiction, Fantasy, and Horror. Read more fascinating info at About DarkSF. These are "original, fresh, and imaginative" creations (from a 2003 Library Journal review to his DarkSF novel Robinson Crusoe 1,000,000 A.D.). Great author Ray Bradbury wrote John a personal fan mail in January 2008, raving about the John T. Cullen dark holiday fantasy The Christmas Clock (a takeoff on Charles Dickens' 1843 classic A Christmas Carol).